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WITNESSES. `I NNNNN OR N nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn c.

UNITED STATES PATENT OFFICE.O

JOHN O*BRIEN, OF NFV YORK, N. Y., ASSIGNOR TO W'ILLIAM BROOKFIELD, OF SAME PLAOE.

TELEGRAPH- SPBCIFICA'I'ION forrning part of Letters Patent No. 316,812, dated April 28, 1885.

Application filcd December 18, 1884. (No model.)

To aZZ whom it may Cancer/t.-

Be it known that I, JoHN O7BRIEN, a citizen of the United States, residing at New York, in the county and State of New York, have invented new and useful Improvements in Telegraph-Insulator-S, of which the following is a specification.

This invention consists in a telegraph-insulator having within its body a transverse hole eXtending in a straight line from side to side thereof, and provided with a rectilinear side` entran ce approximately the length of the transverse hole, and having its lower edge extended laterally in an outward direction beyond the upper edge and terminating below the latter to leave the rectilinear side entrance unob-. structed for the lateral insertion of the linewire.

The invention also consists in other features,which will be hereinafter described and claimed.

In the accompanying drawings, Figure 1 represents a vertical central section in the plane x x, Fig. 2. Fig. 2is a face view. Fig. 3 is a face view of two insulators Secured on telegraph poles with the wire cxtending through the insulators, on a smaller scale than the previous figures.

Similar letters indicate corresponding parts.

In the drawings, the letter A designates a telegraph-insulator, which is, by preference, made of glass, but which may be made of any other material suitable for the purpose.

The insulator shown in the drawings is provided with an internal screw-thread for the purpose of securing the same in position on a telegraphpole; but my invention is not restricted to screw-insnlators, sinceit can be ap plied to insulators provided with other suitable means for securing the same in position on a telegraph-pole.

In my insulator is formed atransverse hole, a, which forms apassage for the wire, and which extends in the line of the wire, and the wire is introduced into this hole through a side entrance, b, which is just wide enough to admit the wire. The sides of this side entrance are rectilinear and not windin g or spiral, so that the wire can be readily passed through into the hole ar, It will be seen from this deseription that the .wire,when once introduced into the hole ((,will be supported in an upward as well as in a downward direction,and at the same time no tiewireis requircchand thelincwire can be drawn tight during the Operation 5 5 of putting it up with the greatest case by a man standing on the ground, and it can also be readily tightened up if ever it should be desirable. The lower edge or lip,c,of the side entrance,b,proiects laterally in an outward dioo rection beyond the upper lip, c', and termin-V ates below the latter, so that it forms a guide to conduct the wire into the hole a.

In order to guard against the danger that the wire may be accidentally forced out of the hole a through the side entrance,b,by gusts of wind or other causes, the side entrance is made oblique in regard to the aXis of the hole, or to the direction in which the line-wire runs; and

by referring to Fig. 3 it will. be readily seen that with an oblique side entrance the wire is not liable to be thrown out of the hole a by the strongest wind or otherwise. At the same time the wire can be ntroduced through the oblique side entrance just as easily as it can 7 5 through a side cntrance parallel with the axis of the hole a.

I am aware that an insulator has been formed with a Vshaped groove in one side to receive the wire; also, that the upper end of an insulator has been fornied with an open top slot having at its bottom lateral incisions for receiving the wire; and, also,'=, that an insulator has been formed with an annular groove and projecting ears arranged above and below the groove for receiving the wire. Such, therefore, I do not claim.

That I claim as new, and desir'e to secure by Letters Patent, is-

1. Atelegraph-insulator constructedwithin go its body with a transverse hole, a, extending in a straight line from side to side thereof, and provided with rectilinear entrance b,approXi-' mately the length of the transverse hole, and

having its lower edge, c, extended laterally in an outward direction beyond the uppcr edge,- c', and terminating below said upper edge, c', to leave the rectilinear side entrance unobstructed for the free lateral insertion of the line-wire, substantially as described.

IOO

2. Atelegmph-insulatorhaving Constructed the oblique side entrance unobstructed for the within its body a transverse hole, a, extendlateral insertion of the Wire, substantially as ing from side to side thereof, and provided described. With a reotilinear side entranee, b, arranged In testimony Whereof I have hereunto set 5 in a line oblique to the longitudinal axis of my hand and seal in the presenee of two sub- 15 the insulator, said side extranee extending apseribing Witnesses.

proximately the length of the transverse hole J OHN OBRIEN. [L 8.] and having its lower edge, c, projecting lat- Vitnesses: erally in an outward direction beyond, but XV. HAUFF,

io terminatling below, the Upper edge, c', toleave E. F. KAsTENI-IUBER. 

